[flutter_tools] Introducing arg option for specifying the output directory for web (#113076)

packages/flutter_tools/lib/src/commands/build_aar.dart

@@ -37,6 +37,7 @@ class BuildAarCommand extends BuildSubCommand {
     addTreeShakeIconsFlag();
     usesFlavorOption();
     usesBuildNumberOption();
+    usesOutputDir();
     usesPubOption();
     addSplitDebugInfoOption();
     addDartObfuscationOption();
@@ -47,16 +48,11 @@ class BuildAarCommand extends BuildSubCommand {
     addEnableExperimentation(hide: !verboseHelp);
     addAndroidSpecificBuildOptions(hide: !verboseHelp);
     argParser
-      ..addMultiOption(
+      .addMultiOption(
         'target-platform',
         defaultsTo: <String>['android-arm', 'android-arm64', 'android-x64'],
         allowed: <String>['android-arm', 'android-arm64', 'android-x86', 'android-x64'],
         help: 'The target platform for which the project is compiled.',
-      )
-      ..addOption(
-        'output-dir',
-        help: 'The absolute path to the directory where the repository is generated. '
-              'By default, this is "<current-directory>android/build".',
       );
   }
 
@@ -142,7 +138,7 @@ class BuildAarCommand extends BuildSubCommand {
       project: _getProject(),
       target: targetFile.path,
       androidBuildInfo: androidBuildInfo,
-      outputDirectoryPath: stringArgDeprecated('output-dir'),
+      outputDirectoryPath: stringArg('output'),
       buildNumber: buildNumber,
     );
     return FlutterCommandResult.success();

packages/flutter_tools/lib/src/commands/build_web.dart

@@ -19,6 +19,7 @@ class BuildWebCommand extends BuildSubCommand {
   }) : super(verboseHelp: verboseHelp) {
     addTreeShakeIconsFlag(enabledByDefault: false);
     usesTargetOption();
+    usesOutputDir();
     usesPubOption();
     usesBuildNumberOption();
     usesBuildNameOption();
@@ -113,6 +114,11 @@ class BuildWebCommand extends BuildSubCommand {
         r'Please add `<base href="$FLUTTER_BASE_HREF">` to web/index.html'
       );
     }
+
+    // Currently supporting options [output-dir] and [output] as
+    // valid approaches for setting output directory of build artifacts
+    final String? outputDirectoryPath = stringArg('output');
+
     displayNullSafetyMode(buildInfo);
     await buildWeb(
       flutterProject,
@@ -124,6 +130,7 @@ class BuildWebCommand extends BuildSubCommand {
       boolArgDeprecated('native-null-assertions'),
       baseHref,
       stringArgDeprecated('dart2js-optimization'),
+      outputDirectoryPath: outputDirectoryPath,
     );
     return FlutterCommandResult.success();
   }

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -392,6 +392,19 @@ abstract class FlutterCommand extends Command<void> {
     _usesPortOption = true;
   }
 
+  /// Add option values for output directory of artifacts
+  void usesOutputDir() {
+    // TODO(eliasyishak): this feature has been added to [BuildWebCommand] and
+    //  [BuildAarCommand]
+    argParser.addOption('output',
+        abbr: 'o',
+        aliases: <String>['output-dir'],
+        help:
+            'The absolute path to the directory where the repository is generated. '
+            'By default, this is <current-directory>/build/<target-platform>.\n'
+            'Currently supported for subcommands: aar, web.');
+  }
+
   void addDevToolsOptions({required bool verboseHelp}) {
     argParser.addFlag(
       kEnableDevTools,

packages/flutter_tools/lib/src/web/compile.dart

@@ -28,10 +28,13 @@ Future<void> buildWeb(
   bool nativeNullAssertions,
   String? baseHref,
   String? dart2jsOptimization,
+  {String? outputDirectoryPath}
 ) async {
   final bool hasWebPlugins = (await findPlugins(flutterProject))
     .any((Plugin p) => p.platforms.containsKey(WebPlugin.kConfigKey));
-  final Directory outputDirectory = globals.fs.directory(getWebBuildDirectory());
+  final Directory outputDirectory = outputDirectoryPath == null
+      ? globals.fs.directory(getWebBuildDirectory())
+      : globals.fs.directory(outputDirectoryPath);
   outputDirectory.createSync(recursive: true);
 
   // The migrators to apply to a Web project.

packages/flutter_tools/test/commands.shard/hermetic/build_web_test.dart

@@ -84,7 +84,7 @@ void main() {
     ProcessManager: () => FakeProcessManager.any(),
   });
 
-  testUsingContext('Builds a web bundle - end to end', () async {
+  testUsingContext('Setup for a web build with default output directory', () async {
     final BuildCommand buildCommand = BuildCommand();
     final CommandRunner<void> runner = createTestCommandRunner(buildCommand);
     setupFileSystemForEndToEndTest(fileSystem);
@@ -116,6 +116,48 @@ void main() {
     }),
   });
 
+  testUsingContext('Setup for a web build with a user specified output directory',
+      () async {
+    final BuildCommand buildCommand = BuildCommand();
+    final CommandRunner<void> runner = createTestCommandRunner(buildCommand);
+
+    setupFileSystemForEndToEndTest(fileSystem);
+
+    const String newBuildDir = 'new_dir';
+    final Directory buildDir = fileSystem.directory(fileSystem.path.join(newBuildDir));
+
+    expect(buildDir.existsSync(), false);
+
+    await runner.run(<String>[
+      'build',
+      'web',
+      '--no-pub',
+      '--output=$newBuildDir'
+    ]);
+
+    expect(buildDir.existsSync(), true);
+  }, overrides: <Type, Generator>{
+    Platform: () => fakePlatform,
+    FileSystem: () => fileSystem,
+    FeatureFlags: () => TestFeatureFlags(isWebEnabled: true),
+    ProcessManager: () => FakeProcessManager.any(),
+    BuildSystem: () => TestBuildSystem.all(BuildResult(success: true), (Target target, Environment environment) {
+      expect(environment.defines, <String, String>{
+        'TargetFile': 'lib/main.dart',
+        'HasWebPlugins': 'true',
+        'cspMode': 'false',
+        'SourceMaps': 'false',
+        'NativeNullAssertions': 'true',
+        'ServiceWorkerStrategy': 'offline-first',
+        'BuildMode': 'release',
+        'DartDefines': 'RkxVVFRFUl9XRUJfQVVUT19ERVRFQ1Q9dHJ1ZQ==',
+        'DartObfuscation': 'false',
+        'TrackWidgetCreation': 'false',
+        'TreeShakeIcons': 'false',
+      });
+    }),
+  });
+
   testUsingContext('hidden if feature flag is not enabled', () async {
     expect(BuildWebCommand(verboseHelp: false).hidden, true);
   }, overrides: <Type, Generator>{